lipsey



parte. anni.

ANDREW n. LIPsnY,

or NEW Y'oiinugr.

` Leners Patent No. 111,356, dated January 31, 1871.

IMPROVEMENTiN HolsTlNG APPARATUS.

The Schedule referred toin these Letters Patent and making part of the same.

To all 'whomji-t 'may concern.

'Be it known that I, .axnnnw B. LirsnY, of' the city7 county, and State of INew York, have inventedl certain new and useful Improvements in Hoisting Apparatus; and I do hereby declare that the follow-- ing is a full, clear, aud exact description thereof, reference being had to the accompanying drawing and tothe letters of reference marked thereon.

A My invention relates to that class or kind of hoisting apparatus in which the vforce necessary to raise or otherwise nieve heavy weights, or to overcome the resistance to motion'ot heavy bodies, is obtained by applying the moving power through or by means oi' a chain or chains working over or upon vwheels 'or pulleys of different dia-meters.

Heretf'ore apparatus ot' this character has consisted of two differential chain-wheels cast in one piece or secured together, with which one endless chain is used; or various combinations of spur-gearing with such chain-wheels, requiring either one or two chains; oracombination'of 011e fixed and one revolving Vin- .tornai gear, a revolving pinion, two chain-pulleys, and

two chains, such as i'sdcseribed in the patent issued to Jonathan Pickering, dated December 1, 1868, and in various English patents. The constructions named, except the rst, are objectionable, because the line of draft does not passthrough the center of weight ot' the double pulley or block, and, consequently, when. in operation, the block is drawn over to one side, which materially increases the friction and resistance. The use of two chains unnecessarily complicates the apparatus and renders it cumbersome and unwieldy,

as does also the various combinations of' gearing heretofore employed.

The form first mentioned requires that one of the chain-grooves should be smaller than the other by at least the length of a space and a tooth, or about one and a halt` times the length of one link of the chain.

This feature limits its usefulness. as a less gain or rise of the load than is thus produced would enable a' less force (applied for a lrniger time) to lif't the load or weight.

The object ot'my invent-ion is to obviate these dif- Iiculties, and to vproduce a hoisting apparatus in which the greatest practicable leverage or gain in lifting force maybe obtained, ora less degree, ii' desired. I

also makea simple, compact, and symmetrical hoist-a ing appara-tus by the use oi" my invention, and one not liable to get.` out ol' repair. For this purpose I use two separate chain-wheels, which may differ as to their diameters in the chain-grooves by at least one link, and each having an internal toothed gear` one of which has elle or more teeth more than the other) iixedupon orcast with it. 'lhesc two internal gears both mesh witha pinion which turns on au eccentric stud, bushing,l or bearing formed upon or fixed tothe spindle on which the chain-wheels are hung. -A single chain `joined at the ends, and a loose or movable.

single-grooved pulley is employed in the same manner as in the common differential pulley-block iirst above mentioned.

In this present forni. of construction the large chain groove and the internal gear having either the larger or the smaller number of teeth may be cast together, and

.the comparative size or proportion of these parts may block.

Figure 71 is a side elevation of one of the internal gears, the pinion and eccentric stud being also shown in their proper positions.

Figure 5 is a vertical central cross-section of' the upper or double block.

A and B are the two pulleys 'or chain-wheels in which the chain-grooves a l and 'the internal gears c d are formed. Teeth or stops are formed on'the sides of the grooves a l to hold the chain and prevent it from slipping.

C is the pin or spindle on which the pulleys revolve. This pin is made square-at c, where it passes through the strap l), so that it may not turn around.

fand g are `journals formed on the said pin C, on which the pulleys A and B revolve.

h is a square portion of' the pin, made smallenough to' pass through the pulley B.

A head, i, and a screw p0rtion,j, on which the nut 7.1 is screwed, complete the pin.

0n the square portion h ot' the pin C an eccentric bushing, stud, or bearing E is lixed, and a spur-pinion, F, hung to rot-atc thereon.

The chain-pulleys A and B (as shown) arclot' the same size, and the internal geardhas one more tooth in it than the internal gear The pinion F meshes or gears with both ot' the internal gears c d, and, therefore, at each revolution of the two pulleys, the pulley B gains on the pulley A a distance equal to the pitch ofthe teeth in the internal gears, measured on the pitch-line. It is evident that, by varying the relative diameters of the chain-grooves a and b and the ijelative number of teeth in the internal gears c and d, any desirablel degree of' leverage or gain may bc obtained.

Gil is the chain by which the weight is sustained and raised and the hoist operated. It is passed from the Figure Sis' an edge view of the, lower or single the various parts for repairs.

point l up over the pulley A to the left, then down and under the loose or friction-pulley H, and up again and over the pulley B. The lower ends l and m are joined, thus forming an endless chain. The lower or hand-loop is broken ofi' at l and 'm to save spaceinv the drawing.

The hook I serves to vsecure the double or differential pulley A B t0 the fnlerum or point-of resistance, and the load or weight to be moved is attached to the piece J. The pulley H maybe placed in either of the loops or bights of the chain with the saine vei'ect, the load in either case being raised by pulling upon one side of the other loop, and'lowered by pulling upon the other side.

By securing the eccentric E to the 'pin C, as' described, the parts may be brought very compactly to- 'gether and the whole block beI made quite symmetrical,- the weight of metal being nearly or quite the same on 'either side of the point of suspension and eqnidistant from the center. From this it results that the load always keeps the centerline of the upper and lower blocks exactly in line with the line of 4 draft, instead of drawing it over to one side, as is the case with nearly all other geared diiferential pulleys.

The load having a tendency to turn the pulleyA in one direction and the pulley B in the opposite direc tion, the strains (by aid of the friction when the chaingrooves differ in size) balance each other and hold the load suspended without the luse of a breakor other stop at any and every point.

The pin C is made ofthe forni shown, in order that it may be inserted through all the parts through which it is vto pass when the said parts are in position. By

this means I am enabled to forge the frame or strap D in one piece and of the proper shape, before pntting the block together, and, also,to readily remove lhe eecentricE is made separate for the same reason only, it being t-o all intents and purposes a part of the pin C, and may be made in one piece withsaid pin, it beingneeessary in such case to make the strap D in two parts and bolt them together. By making the bearingg or the bear,

ing f more or less eccentric to the pin L), the gears c and d may be made to differ in the number of teeth in each by more than one tooth, though when the difference is only one tooth this will not be necessary.

I am aware that various combinations and arrange ments of spur and internal gearing have been applied to the common differential pulley-block, a number of' which have been patentedpin this country and in Europe previous to the date of the above-named patent of Jonathan Pickering; but -I claim none of these. No1l do I conne myself to the application of my invention above described and'illustrated in the accompanying drawing, for, by aid of the description herein contained, any skilled mechanic may readily apply my invention to cranes, windlasscs, stationary hoists, &c., as well as to lathes and other machinery.

Having thus fully described my invention,

I claim- 1. The chain-pulleys A B, constructed with internal differential gears-c d, a common axis, in combination with the pinionF rotating around the eccentric hub E fast on the axis of said pulleys, the said pinion F meshing withthe gears c d in their rotation around their axes, alllarranged'substantially as herein shown and described.

2. The arrangement of the gears cd, pinion F, c ccentrie E, ,and spindle C, with relation to the chainpulleys A B, substantially as and for the purpose specified.

3. The pin or spindle G, having each of the parts c, g, h., and j' of smaller size than the part preceding in the order named, substantially as described, for the purpose hereinabove speeied.

ANDREW B. LIPSEY.

fitnesses IsAAo S. WATERS, H. JAMES Wns'rois.Y 

